The answer has to do with molecules.

A rocket needs to overcome the force of gravity to leave Earth behind.

Wars always include killings and destruction, but there are limits. An expert in international law explains the rules of war laid out in the Geneva Conventions − and why they’re so hard to enforce.

The International Space Station is an engineering feat that has led to countless scientific discoveries. Like the thousands of satellites in orbit, it manages to stay up in the atmosphere.

The universe is constantly expanding, but how do scientists think about what it’s expanding into?

The brain science behind the power struggle between parents and their children.

There’s a lot of hot rock in the way, and sooner or later your hole would collapse.

You can train your brain to wake up on time naturally.

It’s all about perspective: The higher you go, the more you can see the curve.

Jupiter’s composition is more similar to that of the Sun than that of the Earth.